Node DeprecationWarning Treated as Error in CI - Stop the Failing Warning

Node deprecation warnings are advisory by default, but --throw-deprecation upgrades them to thrown errors, so a deprecated API call crashes the job.

What this error means

A CI step exits non-zero on a DeprecationWarning, with a stack rather than a plain warning line, because the process was started with --throw-deprecation.

node

node:internal/process/warning:130
      throw warning;
      ^

DeprecationWarning: The `util.isArray` API is deprecated. Please use
`Array.isArray()` instead.
    at emitDeprecationWarning (node:internal/util:80:11)

Common causes

--throw-deprecation is enabled

A flag or NODE_OPTIONS in CI turns deprecation warnings into thrown errors, so any deprecated API aborts the run.

Code or a dependency uses a deprecated API

A removed-soon API is still being called, and with throw-on-deprecation that call becomes fatal.

How to fix it

Replace the deprecated API

Read the warning to identify the deprecated call.
Switch to the recommended replacement.
Re-run to confirm the warning no longer fires.

JavaScript

Array.isArray(value); // instead of util.isArray(value)

Drop the throw-deprecation flag if intentional warnings remain

Remove --throw-deprecation from NODE_OPTIONS or the run command.
Address the underlying deprecated calls separately.

How to prevent it

Keep --throw-deprecation off in CI unless you are deliberately auditing, fix deprecated API usage promptly, and watch dependency upgrade notes for newly deprecated calls.